Protectant fungicide Respray Dates for Secondary Scab Suppression

Background Information for this page
Return to radar list for Monmouth ME
     This table estimates fungicide intervals for suppressing spread of secondary scab.  Use the appropriate primary scab respray guidelines instead of this table until ascospore releases are completed.  Rules used to estimate protection depletion are described on the Background Information page (see link above). 
    
Green text and yellow background indicates dates after final primary scab control sprays until the date scab control can be confirmed by scouting for presence of 2nd generation scab lesions.    
    Brown text with grey background indicates dates when 2nd generation scab lesions from the final ascospore release have had time to begin appearing.  By this point, growers will have had opportunity to confirm the status of primary scab control.  Estimates for these dates are provided only for those situations where scab control has not been successful, and there are enough active scab infections present to cause an unacceptable risk of fruit scab infection.  In that case, fungicide protection is needed for at least 4 weeks until active scab lesions exhaust their supply of spores. 
    Depending on scab severity, market sensitivity, temperatures, rain frequency, and proximity to harvest; shorter or longer fungicide intervals to suppress spread from active scab lesions may be more appropriate than the estimates shown below. 
      The estimated date for 95+% scab ascsopore release at this site is: June 1.    The estimated McIntosh fruit set date for this site is May 20.  The approximate terminal bud set date for this site is July 6.
Weather data for Monmouth ME.  Forecast values begin September 2, 2010
Inches Rain Previous
Spray Date
- protection end date
estimate assumes that fungicide was applied
before any rain on spray date.
Secondary Scab
Protection End Date
for full dose
captan, mancozeb or other protectant fungicide applied on spray date 
Percent of primary scab potential beginning to show
as (1st generation)
&
2nd generation
lesions by end of protection
Respray Deadline
= Start date for next scab infection period after protection ends
0 Tue,  May  25   June 6, Sun (90%)   5% June 10,  Thu
0 Wed,  May  26   June 6, Sun (90%)   5% June 10,  Thu
0 Thu,  May  27   June 6, Sun (90%)   5% June 10,  Thu
0 Fri,  May  28   June 6, Sun (90%)   5% June 10,  Thu
0 Sat,  May  29   June 6, Sun (90%)   5% June 10,  Thu
0 Sun,  May  30   June 6, Sun (90%)   5% June 10,  Thu
0 Mon,  May  31   June 6, Sun (90%)   5% June 10,  Thu
0.51 Tue,  June  1   June 6, Sun (90%)   5% June 10,  Thu
0 Wed,  June  2   June 6, Sun (90%)   5% June 10,  Thu
0.35 Thu,  June  3   June 6, Sun (90%)   5% June 10,  Thu
0 Fri,  June  4   June 6, Sun (90%)   5% June 10,  Thu
0.98 Sat,  June  5   June 17, Thu (100%)   90% June 20,  Sun
1.09 Sun,  June  6   June 21, Mon 90% June 23,  Wed
0 Mon,  June  7   June 22, Tue   90% June 23,  Wed
0.04 Tue,  June  8   June 22, Tue 90% June 23,  Wed
0 Wed,  June  9   June 23, Wed 90% June 23,  Wed
0.40 Thu,  June  10   June 23, Wed 90% June 23,  Wed
0 Fri,  June  11   June 24, Thu 90% June 26,  Sat
0.01 Sat,  June  12   June 24, Thu 90% June 26,  Sat
0 Sun,  June  13   June 24, Thu 90% June 26,  Sat
0.17 Mon,  June  14   June 26, Sat   99% June 26,  Sat
0 Tue,  June  15   June 26, Sat 99% June 26,  Sat
0.24 Wed,  June  16   June 28, Mon 100% July 1,  Thu
0.27 Thu,  June  17   June 28, Mon July 1,  Thu
0 Fri,  June  18   June 28, Mon July 1,  Thu
0 Sat,  June  19   June 28, Mon July 1,  Thu
0.51 Sun,  June  20   June 28, Mon July 1,  Thu
0 Mon,  June  21   June 28, Mon     July 1,  Thu
0 Tue,  June  22   June 28, Mon July 1,  Thu
0.55 Wed,  June  23   July 1, Thu July 1,  Thu
0.42 Thu,  June  24   July 8, Thu July 10,  Sat
0 Fri,  June  25   July 9, Fri July 10,  Sat
0.02 Sat,  June  26   July 10, Sat July 10,  Sat
0.07 Sun,  June  27   July 10, Sat July 10,  Sat
1.14 Mon,  June  28   July 12, Mon     July 13,  Tue
0.29 Tue,  June  29   July 13, Tue July 13,  Tue
0 Wed,  June  30   July 14, Wed July 17,  Sat
0.28 Thu,  July  1   July 15, Thu July 17,  Sat
0 Fri,  July  2   July 16, Fri July 17,  Sat
0 Sat,  July  3   July 17, Sat July 17,  Sat
0 Sun,  July  4   July 18, Sun July 19,  Mon
0 Mon,  July  5   July 19, Mon     July 19,  Mon
0 Tue,  July  6   July 20, Tue July 21,  Wed
0 Wed,  July  7   July 21, Wed July 21,  Wed
0 Thu,  July  8   July 21, Wed July 21,  Wed
0 Fri,  July  9   July 21, Wed July 21,  Wed
0.48 Sat,  July  10   July 21, Wed July 21,  Wed
0.43 Sun,  July  11   July 21, Wed July 21,  Wed
0 Mon,  July  12   July 21, Wed     July 21,  Wed
0.10 Tue,  July  13   July 21, Wed July 21,  Wed
0.73 Wed,  July  14   July 25, Sun July 28,  Wed
0 Thu,  July  15   July 25, Sun July 28,  Wed
0 Fri,  July  16   July 25, Sun July 28,  Wed
0.02 Sat,  July  17   July 25, Sun July 28,  Wed
0 Sun,  July  18   July 25, Sun July 28,  Wed
0.01 Mon,  July  19   July 25, Sun     July 28,  Wed
0 Tue,  July  20   July 25, Sun July 28,  Wed
1.42 Wed,  July  21   August 4, Wed August 9,  Mon
0.15 Thu,  July  22   August 4, Wed August 9,  Mon
0 Fri,  July  23   August 4, Wed August 9,  Mon
0.25 Sat,  July  24   August 4, Wed August 9,  Mon
0.75 Sun,  July  25   August 8, Sun August 9,  Mon
0 Mon,  July  26   August 9, Mon     August 9,  Mon
0 Tue,  July  27   August 10, Tue August 10,  Tue
0.02 Wed,  July  28   August 11, Wed August 16,  Mon
0.16 Thu,  July  29   August 12, Thu August 16,  Mon
0 Fri,  July  30   August 13, Fri August 16,  Mon
0 Sat,  July  31   August 14, Sat August 16,  Mon
0 Sun,  August  1   August 15, Sun August 16,  Mon
0.10 Mon,  August  2   August 16, Mon     August 22,  Sun
0.50 Tue,  August  3   August 17, Tue August 22,  Sun
0.54 Wed,  August  4   August 18, Wed August 22,  Sun
0 Thu,  August  5   August 19, Thu August 22,  Sun
0 Fri,  August  6   August 20, Fri August 22,  Sun
0 Sat,  August  7   August 21, Sat August 22,  Sun
0 Sun,  August  8   August 22, Sun August 22,  Sun
0.33 Mon,  August  9   August 23, Mon     August 25,  Wed
0.29 Tue,  August  10   August 24, Tue August 25,  Wed
0.02 Wed,  August  11   August 25, Wed August 26,  Thu
0 Thu,  August  12   August 25, Wed August 26,  Thu
0 Fri,  August  13   August 25, Wed  
0 Sat,  August  14   August 25, Wed  
0 Sun,  August  15   August 25, Wed  
0.20 Mon,  August  16   August 26, Thu      
0 Tue,  August  17   August 26, Thu  
0 Wed,  August  18   August 26, Thu  
0 Thu,  August  19   August 26, Thu  
0 Fri,  August  20   August 26, Thu  
0 Sat,  August  21   August 26, Thu  
0.08 Sun,  August  22   August 26, Thu  
0.05 Mon,  August  23   September 3, Fri      
0 Tue,  August  24   September 3, Fri  
1.80 Wed,  August  25   September 8, Wed  
0.19 Thu,  August  26   September 9, Thu  
0 Fri,  August  27   September 10, Fri  
0 Sat,  August  28   September 11, Sat  
0 Sun,  August  29   ############  
0 Mon,  August  30   ############      
0 Tue,  August  31   ############